[DOCS] fix wrong default pod template example

[eddycharly]

Changes

This pr fixes the default pod template example in the docs.

The example was showing some configuration to add pod annotations but this isn't supported in pod templates.
I replaced the example content with a node selector instead.

[tekton-robot]

Hi @eddycharly. Thanks for your PR.

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[eddycharly]

/assign @vdemeester

[vdemeester]

/ok-to-test

[vdemeester]

/lgtm
/meow

[tekton-robot]

@vdemeester:

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/lgtm
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[tekton-robot]

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